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Growth behaviour of low-energy plasma electrolytic oxidation coatings on a magnesium alloy

Published on Sep 1, 2018in Journal of Magnesium and Alloys
· DOI :10.1016/j.jma.2018.05.008
Vahid Dehnavi5
Estimated H-index: 5
(UWO: University of Western Ontario),
W.J. Binns1
Estimated H-index: 1
(UWO: University of Western Ontario)
+ 2 AuthorsBen Li Luan4
Estimated H-index: 4
(USTB: University of Science and Technology Beijing)
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Abstract
Abstract Plasma electrolytic oxidation (PEO), a promising surface treatment method to improve the corrosion and wear resistance of magnesium and its alloys, operates at high voltages, resulting in a relatively high energy cost. To make the PEO process more economically viable, its energy efficiency needs to be improved. This study investigates the growth behaviour and microstructural characteristics of low-energy PEO coatings on an AM50 magnesium alloy in a concentrated electrolyte containing sodium tetraborate. The surface morphology of the coatings was different from typical PEO coating morphologies and a large voltage oscillation was observed during treatment. Using different characterisation techniques, and based on a micro-discharge model, a correlation was made between the voltage-time behaviour, micro-discharge characteristics and the composition and microstructure of the coated samples. The results suggest electrolyte chemistry can somewhat control discharge behaviour, which plays an important role in PEO coating growth.
  • References (46)
  • Citations (2)
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References46
Newest
Published on Jul 1, 2017in Surface & Coatings Technology 3.19
Yi Zhang3
Estimated H-index: 3
(Technology College),
Ye-kang Wu3
Estimated H-index: 3
(Technology College)
+ 7 AuthorsPhilip Nash27
Estimated H-index: 27
(IIT: Illinois Institute of Technology)
Abstract In this study, plasma electrolytic oxidation (PEO) coatings were produced on pure aluminum in an in-house developed composite electrolyte at three current densities of 2.2 A/dm 2 , 4.4 A/dm 2 and 8.8 A/dm 2 , respectively. The coatings were investigated based on the observation and measurement of the working voltage, surface microdischarges and morphologies of surface, polished cross-section, fracture cross-section and inner surface of the coatings, by using scanning electron microscopy...
E. Matykina17
Estimated H-index: 17
(Complutense University of Madrid),
R. Arrabal5
Estimated H-index: 5
(Complutense University of Madrid)
+ 4 AuthorsM.C. Merino25
Estimated H-index: 25
(Complutense University of Madrid)
Abstract Plasma electrolytic oxidation (PEO) coatings developed under voltage-controlled mode on various commercial wrought, gravity cast and rheocast aluminium alloys were discussed with respect to enhancement of their tribological and corrosion performance and minimization of the PEO energy consumption. It is demonstrated that use of conventional porous anodic film precursors reduces the PEO energy consumption by up to 50%. The wear of 6082 alloy with PEO coatings with added α -Al 2 O 3 partic...
Published on Jun 1, 2017in Electrochimica Acta 5.38
Sachiko Ono26
Estimated H-index: 26
(Kogakuin University),
Shuichi Moronuki1
Estimated H-index: 1
(Kogakuin University)
+ 3 AuthorsHidetaka Asoh17
Estimated H-index: 17
(Kogakuin University)
Abstract The thickness and corrosion resistance of films formed on AZ31 magnesium alloys through plasma electrolytic oxidation for the same amount of electricity supplied increased with decreasing electrolyte concentration irrespective of the current density. For all electrolytes of phosphate, silicate, and aluminate, the initial bending/breakdown voltage increased linearly with the logarithm of the decreasing electrolyte concentration and exhibited no dependence on the current density. The chem...
Published on Mar 1, 2017in Journal of Magnesium and Alloys
Gh. Barati Darband5
Estimated H-index: 5
(TMU: Tarbiat Modares University),
M. Aliofkhazraei20
Estimated H-index: 20
(TMU: Tarbiat Modares University)
+ 1 AuthorsN. Valizade1
Estimated H-index: 1
(TMU: Tarbiat Modares University)
Abstract Plasma Electrolyte Oxidation (PEO) process has increasingly been employed to improve magnesium surface properties by fabrication of an MgO-based coating. Originating from conventional anodizing procedures, this high-voltage process produces an adhesive ceramic film on the surface. The present article provides a comprehensive review around mechanisms of PEO coatings fabrication and their different properties. Due to complexity of PEO coatings formation, a complete explanation regarding f...
Published on Dec 1, 2016in Surface & Coatings Technology 3.19
Xiaopeng Lu12
Estimated H-index: 12
,
M. Mohedano20
Estimated H-index: 20
+ 4 AuthorsMikhail L. Zheludkevich45
Estimated H-index: 45
(University of Aveiro)
Abstract Plasma electrolytic oxidation (PEO) processing for light metals is known for decades and has been established as a well-known industrial surface treatment offering a reasonable wear and corrosion protection. However, long-term protection is compromised by the intrinsic porosity and limited range of composition in the PEO layer. A novel approach is to introduce particles to the electrolyte, aiming at their in-situ incorporation into PEO coatings during growth. The idea is that with the h...
Published on Dec 1, 2015in Materials Letters 3.02
Sungmo Moon1
Estimated H-index: 1
(UST: Korea University of Science and Technology),
R. Arrabal21
Estimated H-index: 21
(Complutense University of Madrid),
E. Matykina17
Estimated H-index: 17
(Complutense University of Madrid)
Abstract In this work, observation of 3-dimensional network structure of open-pores in plasma electrolytic oxidation (PEO) films is reported for the first time using a resin replica method. Conventional plane and cross-sectional views of PEO films provide only 2-dimensional information on the shape and size of pores in PEO films, while an epoxy replica, which was prepared by infiltrating a mixture of liquid epoxy resin and hardener into the open-pores in PEO films under high vacuum and hardening...
Published on Dec 1, 2015in Corrosion Science 6.36
Xiaopeng Lu12
Estimated H-index: 12
(MPG: Max Planck Society),
Carsten Blawert39
Estimated H-index: 39
(MPG: Max Planck Society)
+ 1 AuthorsKarl Ulrich Kainer40
Estimated H-index: 40
(MPG: Max Planck Society)
Abstract Plasma electrolytic oxidation (PEO) processing has received considerable attention for improving the corrosion or wear resistance of magnesium and its alloys. However, it cannot provide high-barrier long-term protection due to its high porosity. A novel approach is to introduce reactive particles to PEO coatings, aiming to seal the porosity and to provide wider range of coating compositions. Experiments with nano- and micro-sized SiO 2 particles and different concentrations of KOH in th...
Published on Nov 1, 2015in Acta Astronautica 2.48
Hang Li4
Estimated H-index: 4
(HIT: Harbin Institute of Technology),
Songtao Lu10
Estimated H-index: 10
(HIT: Harbin Institute of Technology)
+ 2 AuthorsXiaohong Wu20
Estimated H-index: 20
(HIT: Harbin Institute of Technology)
Abstract In this paper, Al-doped ceramic coatings with a thickness of 22–27 µm were prepared on AZ31 magnesium alloy by plasma electrolytic oxidation (PEO) in electrolytes that contain varied concentrations of NaAlO 2 , aiming to improve its wear resistance under vacuum low-temperature (−50 °C) condition. These obtained ceramic coating were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The results show that the ceramic co...
Published on Oct 1, 2015in Surface & Coatings Technology 3.19
Chen Liu4
Estimated H-index: 4
(Technology College),
Donglei He5
Estimated H-index: 5
+ 7 AuthorsDejiu Shen7
Estimated H-index: 7
(Technology College)
Abstract Plasma electrolytic oxidation (PEO) coatings were fabricated on AA1060 commercial pure aluminum and detached from the substrate by an electrochemical method. The front view and fracture cross-section morphologies of the coating/substrate (C/S) interface were observed by scanning electron microscopy (SEM). The results show that the C/S interface layer consists of inter-connected tiny globular particles. During the PEO process, the thickness of the C/S interface layer and the diameter of ...
Published on Oct 1, 2015in Journal of Solid State Electrochemistry 2.53
Delphine Veys-Renaux10
Estimated H-index: 10
(University of Lorraine),
Emmanuel Rocca18
Estimated H-index: 18
(University of Lorraine)
The electrochemical behaviour of AA1050 and AA2214 alloys was studied in a KOH/silicate in order to investigate the first stages of the coating formation during MAO process (by SEM and electrochemical measurements). Before the sparking initiation, occurring around 300 V for both alloys, a thin inner layer of aluminium oxide grows by a classical anodizing mechanism, and induces a great enhancement of the electrochemical resistance. Then, the micro-arc regime beyond 300 V leads to the formation of...
Cited By2
Newest
Published on Jul 1, 2019in Surface & Coatings Technology 3.19
Abstract Due to its low density and high strength, magnesium has increasing potential in the lightweight area, especially as a material for structural components. To address the corrosion problem, which is the main issue with using Mg alloys in the automotive industry, as well as to address wear problems, a new technique that uses an asymmetric potential pulse waveform to form nanocrystalline PEO (plasma electrolytical oxidation) coatings on Mg substrates, especially on sheet Mg plates, is devel...
Published on Feb 7, 2019
This paper describes a design approach to a control system of power supply for high-voltage electrochemical processes such as plasma electrolytic oxidation (PEO) or high-voltage anodising (HVA), which require alternating polarisation pulses up to 750 V and a typical current density of 50–500 mA/cm2. Complex characteristics of the electrochemical system response on applied polarisations (positive or negative) cause necessity of precise control of polarising pulse shapes for better process operati...